There is no need to use a simplified or 'linear' leap-year correction
calculation. For any algebraic Gregorian year value y the exact signed
number of leap-year correction days in preceding years is easily calculated
by the method of inclusions and exclusions. It is just
C(y) = 365(y - 1)
+ (y - 1)//4
- (y - 1)//100
+ (y - 1)//400
in which '//' denotes remainder-discarding binary-integer division.
John Gilmore
Ashland, MA 01721
USA
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